# HG changeset patch
# User Jonas Schäfer <jonas@wielicki.name>
# Date 1612105754 -3600
# Node ID 1185acb2ab914b9a5d6c0aac61cd69c3d7d9cb2f
# Parent  8c31d4b872c3659a0cea62215b0e7ef4d72be393
mod_groups_internal: handle empty groups correctly

Otherwise, this causes a traceback when syncing the group.

diff -r 8c31d4b872c3 -r 1185acb2ab91 mod_groups_internal/mod_groups_internal.lua
--- a/mod_groups_internal/mod_groups_internal.lua	Sun Jan 31 12:20:03 2021 +0100
+++ b/mod_groups_internal/mod_groups_internal.lua	Sun Jan 31 16:09:14 2021 +0100
@@ -62,7 +62,11 @@
 end
 
 local function do_all_group_subscriptions_by_group(group_id)
-	for membername in pairs(get_members(group_id)) do
+	local members = get_members(group_id)
+	if not members then
+		return
+	end
+	for membername in pairs(members) do
 		do_single_group_subscriptions(membername, group_id);
 	end
 end